package andy.demo.ipc;

import android.app.Activity;
import android.os.Bundle;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MessageExample extends Activity implements OnClickListener {
	private final int WC = LinearLayout.LayoutParams.WRAP_CONTENT;
	private final int FP = LinearLayout.LayoutParams.FILL_PARENT;
	
	public TextView tv;
	private EventHandler mHandler;
	private Handler mOtherThreadHandler = null;
	private Button btn, btn2, btn3, btn4, btn5, btn6;
	private NoLooperThread noLooerThread = null;
	private OwnLooperThread ownLooperThread = null;
	private ReceiveMessageThread receiveMessageThread = null;
	private Context context = null;
	private final String sTag = "MessageExample";
	private boolean postRunnable = false;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		context = this.getApplicationContext();
		
		LinearLayout layout = new LinearLayout(this);
		layout.setOrientation(LinearLayout.VERTICAL);
		
		btn = new Button(this);
		btn.setId(101);
		btn.setText("message from main thread self");
		btn.setOnClickListener(this);
		LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
		param.topMargin = 10;
		layout.addView(btn, param);
		
		btn2 = new Button(this);
		btn2.setId(102);
		btn2.setText("message from other thread to main thread");
		btn2.setOnClickListener(this);
		layout.addView(btn2, param);
		
		btn3 = new Button(this);
		btn3.setId(103);
		btn3.setText("message to other thread from itself");
		btn3.setOnClickListener(this);
		layout.addView(btn3, param);
		
		btn4 = new Button(this);
		btn4.setId(104);
		btn4.setText("message with Runnable as callback from other thread to main thread");
		btn4.setOnClickListener(this);
		layout.addView(btn4, param);
		
		btn5 = new Button(this);
		btn5.setId(105);
		btn5.setText("main thread's message to other thread");
		btn5.setOnClickListener(this);
		layout.addView(btn5, param);
		
		btn6 = new Button(this);
		btn6.setId(106);
		btn6.setText("exit");
		btn6.setOnClickListener(this);
		layout.addView(btn6, param);
		
		tv = new TextView(this);
		tv.setTextColor(Color.WHITE);
		tv.setText("");
		LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams(FP, WC);
		param2.topMargin = 10;
		layout.addView(tv, param2);
		
		setContentView(layout);

		// 主线程要发送消息给other thread， 这里创建那个other thread
		receiveMessageThread = new ReceiveMessageThread();
		receiveMessageThread.start();
	}

	// implement the OnClickListener interface
	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case 101:
			// 主线程发送消息给自己
			Looper looper;
			looper = Looper.myLooper();// get the Main looper related with the
										// main thread
			// 如果不给任何参数的话会用当前线程对应的Looper(这里就是Main Looper)为Handler里面的成员mLooper赋值
			mHandler = new EventHandler(looper);
			// mHandler = new EventHandler();
			// 清除整个MessageQueue里的消息
			mHandler.removeMessages(0);
			String obj = "This main thread's message and received by itself!";
			// 得到Message对象
			Message m = mHandler.obtainMessage(1, 1, 1, obj);
			// 将Message对象送入到main thread的MessageQueue里面
			mHandler.sendMessage(m);
			break;
		case 102:
			// other线程发送消息给主线程
			postRunnable = false;
			noLooerThread = new NoLooperThread();
			noLooerThread.start();
			break;
		case 103:
			// other thread获取它自己发送的消息
			tv.setText("please look at the error level log for other thread received message");
			ownLooperThread = new OwnLooperThread();
			ownLooperThread.start();
			break;
		case 104:
			// other thread通过Post Runnable方式发送消息给主线程
			postRunnable = true;
			noLooerThread = new NoLooperThread();
			noLooerThread.start();
			break;
		case 105:
			// 主线程发送消息给other thread
			if (null != mOtherThreadHandler) {
				tv.setText("please look at the error level log for other thread received message from main thread");
				String msgObj = "message from mainThread";
				Message mainThreadMsg = mOtherThreadHandler.obtainMessage(1, 1,
						1, msgObj);
				mOtherThreadHandler.sendMessage(mainThreadMsg);
			}
			break;
		case 106:
			finish();
			break;
		}
	}

	class EventHandler extends Handler {
		public EventHandler(Looper looper) {
			super(looper);
		}

		public EventHandler() {
			super();
		}

		public void handleMessage(Message msg) {
			// 可以根据msg.what执行不同的处理，这里没有这么做
			switch (msg.what) {
			case 1:
				tv.setText((String) msg.obj);
				break;
			case 2:
				tv.setText((String) msg.obj);
				noLooerThread.stop();
				break;
			case 3:
				// 不能在非主线程的线程里面更新UI，所以这里通过Log打印收到的消息
				Log.e(sTag, (String) msg.obj);
				ownLooperThread.stop();
				break;
			default:
				// 不能在非主线程的线程里面更新UI，所以这里通过Log打印收到的消息
				Log.e(sTag, (String) msg.obj);
				break;
			}
		}
	}

	// NoLooperThread
	class NoLooperThread extends Thread {
		
		private EventHandler mNoLooperThreadHandler;

		public void run() {
			Looper myLooper, mainLooper;
			myLooper = Looper.myLooper();  //获取当前线程的looper对象  
//			Looper.prepare();//此方法会创建当前线程的looper，而myLooper只是获取当前线程的looper，而子线程默认是没有looper的
			mainLooper = Looper.getMainLooper(); // 这是一个static函数  获取主线程的looper对象
			String obj;
			if (myLooper == null) {
				System.out.println("NoLooperThread : myLooper = null");
				mNoLooperThreadHandler = new EventHandler(mainLooper); //用来处理main线程的Handler对象
				obj = "NoLooperThread has no looper and handleMessage function executed in main thread!";
			} else {
				mNoLooperThreadHandler = new EventHandler(myLooper);  //用来处理当前(this)线程的Handler对象
				obj = "This is from NoLooperThread self and handleMessage function executed in NoLooperThread!";
			}
			mNoLooperThreadHandler.removeMessages(0);
			if (false == postRunnable) {
				// send message to main thread
				Message m = mNoLooperThreadHandler.obtainMessage(2, 1, 1, obj);
				mNoLooperThreadHandler.sendMessage(m);
				Log.e(sTag, "NoLooperThread id:" + this.getId());
			} else {
				// 下面new出来的实现了Runnable接口的对象中run函数是在Main
				// Thread中执行，不是在NoLooperThread中执行
				// 注意Runnable是一个接口，它里面的run函数被执行时不会再新建一个线程
				// 您可以在run上加断点然后在eclipse调试中看它在哪个线程中执行
				mNoLooperThreadHandler.post(new Runnable() {
					@Override
					public void run() {
						tv.setText("update UI through handler post runnalbe mechanism!");
						noLooerThread.stop();
					}
				});
			}
		}
	}

	// OwnLooperThread has his own message queue by execute Looper.prepare();
	class OwnLooperThread extends Thread {
		private EventHandler mOwnLooperThreadHandler;

		public void run() {
			Looper.prepare();//这里是和NoLooperThread最大的不同。
			Looper myLooper, mainLooper;
			myLooper = Looper.myLooper();
			mainLooper = Looper.getMainLooper(); // 这是一个static函数
			String obj;
			if (myLooper == null) {
				mOwnLooperThreadHandler = new EventHandler(mainLooper);
				obj = "OwnLooperThread has no looper and handleMessage function executed in main thread!";
			} else {
				mOwnLooperThreadHandler = new EventHandler(myLooper);
				obj = "This is from OwnLooperThread self and handleMessage function executed in NoLooperThread!";
			}
			mOwnLooperThreadHandler.removeMessages(0);
			// 给自己发送消息
			Message m = mOwnLooperThreadHandler.obtainMessage(3, 1, 1, obj);
			mOwnLooperThreadHandler.sendMessage(m);
			Looper.loop();
		}
	}

	// ReceiveMessageThread has his own message queue by execute
	// Looper.prepare();
	class ReceiveMessageThread extends Thread {
		public void run() {
			
			Looper.prepare();
			mOtherThreadHandler = new Handler() {
				public void handleMessage(Message msg) {
					
					Log.e(sTag, (String) msg.obj);
				}
			};
			Looper.loop();
		}
	}

}